1 1/2 lbs. of frozen hash browns (cubes)
2 med. onions, finely chopped
2 cans cream of mushroom soup
1 (8 oz.) carton sour cream
3 c. grated Cheddar cheese

Spray a 2 1/2 quart baking dish with Pam. Pour the hashbrowns into the dish. Mix onions, cream of mushroom soup, sour cream and 2 cups of Cheddar cheese together, and pour over the hashbrowns. Bake at 350 degrees for 45 minutes uncovered. Remove from oven. Top with remaining 1 cup of Cheddar cheese. Return to oven until cheese is melted and bubbling (about 10 minutes).